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RTP Payload for Comfort Noise

RTP Payload for Comfort Noise. Robert Zopf Lucent Technologies. Speech Communication System with DTX. Speech Communication System with DTX. Voice Activity Detector (VAD) - classify speech frame as active or inactive

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RTP Payload for Comfort Noise

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  1. RTP Payload for Comfort Noise Robert Zopf Lucent Technologies

  2. Speech Communication System with DTX

  3. Speech Communication System with DTX • Voice Activity Detector (VAD) - classify speech frame as active or inactive • Discontinuous Transmission (DTX) - update rate of background noise parameters • Comfort Noise Generation (CNG) - analysis of background noise parameters (encoder) and synthesis of comfort noise (decoder)

  4. ITU-T G.711 Appendix II • Comfort noise payload definition • approved at ITU-T February 2000 SG16 • tested (MOS) using G.729B VAD/DTX and example algorithm (described in Appendix) using 10th order spectral model • equivalent to G.711 without comfort noise • flexible for use with any codec • guidelines for use in Appendix

  5. CN Payload Format • Energy Level equivalent to previous drafts. • Spectral Content - Reflection Coeffs (quantized indices Ni) • Level is mandatory, spectrum optional • 0th order model reduces to previous def.

  6. Open Issues • compatibility with existing Level Only implementations • 1 CN frame per RTP packet (to determine model order) • multiple channels must use the same model order

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